-3x+2y=-60 x=30 jak policzyć y???
-3*30+2y=60
-90-60=-2y
-150=-2y/:-2
y=75
-3x+2y=-60 /*(-3)
-x + (-6y) = 180
-x = 180+6y /* (-1)
x= -180-6y
-3 * (-180-6y) +2y =-60
540+18y +2y =-60
20y=-60-540
20y=-600/:20
y=30
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-3*30+2y=60
-90-60=-2y
-150=-2y/:-2
y=75
-3x+2y=-60 /*(-3)
-x + (-6y) = 180
-x = 180+6y /* (-1)
x= -180-6y
-3 * (-180-6y) +2y =-60
540+18y +2y =-60
20y=-60-540
20y=-600/:20
y=30